I purchased Turbo Pascal 3 for Amstrad CPC 6128 with my pocket money back in 1989(?). That was 1000 FF back then (~275€ today) so quite a big sum for a teenager. My dad took pity on me and funded 50% of it. Best investment ever!

Learning Pascal after Locomotive Basic was night and day. And the speeeeeed! I could finally compute 320x200 Mandelbrot set renderings in reasonable amounts of time (few minutes IIRC).

I still have the disk & manual somewhere, as well as a couple related books. And for whatever reason Ctrl-K Ctrl-W still haunts my mind.

It's really mind boggling that the entire thing (CP/M + IDE + compiler + libraries) fit on one side of a 3" floppy disk (<180 kB).